If anyone has access to a genie wish, might I suggest:
"I wish any rental that saw the rent on it raised by more than twice the inflation rate, once it is no longer occupied, would instantly burst into flames and burn to ashes in a way that damages no other rental unit."
Maybe for the first few, but after awhile it would be common knowledge that raising rents too much magically causes building to burst into flames. Insurance doesn't cover intentional acts. If you deliberately burn your own house down, insurance isn't going to cover that. Plus every insurance policy would exclude coverage for this sort of entirely predictable and preventable fire.